Thank you @akohlmey for your response. I am asking this because, on several topics, I have seen that there is a discussion about mailing list of detailed discussion about this code. For example, here in this link [lammps-users] temperature rising. Also, the modification has been recorded on the Lammps website LAMMPS History, under the name of Craig Terrey. So, I was wondering where can I find this code. Also, I would appreciate it if someone could advise on how can I modify rNEMD command to do the swapping for atoms of different masses. I did not find any specific recommendation for this in the mailing list or in LAMMPS documentation.
Thank you,